Cup



M. SIDON Dec. 28, 1937.

CUP

Filed Dec. 11. 1956 l l I B 6MM fww ATTORNEYS.

Patented Dec. 28, 1937 UNITEDv STATES PATENT `OFFICE CUP 'of New York Application December 11, 193s, serial No. 115,407`

3 Claims.

This invention relates to containers fabricated from flexible material such as paper, and more particularly relates to a bottom 'structure for a container of the Adrinking cup type.

An object ofthe invention is to provide a rigid and durable container including a bottom structure effecting a liquid-tight seal between the bottom and the body of the container.

'Ihe invention consists in the novel features and in the combinations and constructions hereinafter set forth ,and claimed.

In describing this invention, reference is had to the accompanying drawing in which like characters designate corresponding parts in all the views.

Figure 1 is a side elevation, partly in section, of a cup embodying my invention.

Figure 2 is a fragmentary, sectional view of the cup taken on lines 2--2, Figure 1, and of the bottom forming mechanism.

'I'his invention is directed particularly to the bottom structure of a container, the body portionl of which is comparatively stiff, it being here shown as formed by eonvolutely wound layers of flexible material, such as paper. Containers have been made heretofore, the body portions of which have been formed with overlapping layers of material in order to impart suiilcient rigidity and durability to the container, particularly where the container is of the cup type and is intended for use with hot liquids. Also heretofore, bottom structures have been secured to the body portion of the container by folding the lower end of the container inwardly over the edge of the bottom flange. However, when the side wall of the body of the container is formed of thick niaterial, or a plurality of layers of material, the infolded portion of the body has a tendency to spring inwardly a' ay from the flange of the boti tom necessitating the use of an extra amount of glue 'and even then, leaks often occur between the bottom and the body particularly along the seam where the sides of the-body overlap. The chief object ofthis invention has to do with a bottom structure wherein these disadvantages are overcome.

As here shown, composed of two layers of flexible as paper. with the result that there are three thicknesses of material where the ends of the body pieces overlap producing a ridge II extending lengthwise on the inner side of the body.

The bottom member comprises a discoidal portion I2 formed with a depending annular flange thebody I0 of` the container is material, such 'Ihe layers are convolutely wound.'

(ci. 22e-5.5)

I3. 'I'he body here shown is tapered inwardly toward the bottom, and the bottom member is inserted in the body with the flange I3 spaced a short distance 'from the lower end of the body. 'I'he side wall of the body, extending beyond the flange I3, as indicated by dotted outline Figure 7, is turned over the edge of the flange and inwardly against the inner side of the flange I3, see Figure 1, the outer layer of the body now becoming the inner layer of the infolded Due to the stiffness and rigidity of the side wall of the body, the infolded portion. has a tendency to assume an angular position relative to the flange I3 of the bottom member. 'Ihat is, the free end of the inturned portion tends to spring inwardly away from the flange I3. 'I'his is also due to the fact that the side wall of the container is of tapered formation and the ange I3 tapers outwardly las it approaches the discoidal portion I2. A l

By my invention, the bottom ange I3 is formed of appreciable length, and the infolded portion of the'ide wall of the cup is pressed inwardly against the inner side of the flange I3 and simultaneously, the impressed portion is expanded radially outwardly and so formed as to maintain such expansion, whereby it assumes a position against the inner surface of the flange I3 of the bottom. This situation is brought about by placing the bottom portion of the cup into an annular member I5 formed with a tapered bore complemental to that of the side wall of the cup with the lower end of the cup extending below the annular member I3, as indicated by dotted lines Figure 1. The bottom member is then pressed into position with the flange I3 extending downwardly, and the depending end wall of the body is folded or crimped inwardly over the edge of the flange I3 and thereafter the roller I6 is inserted in the lower end of the cup, that is, below the discoidal portion I2 of the bottom member. This roller I6 is provided on its periphery with longitudinally extending serrations I1. The roller I6 is slightly less in diameter than the inner diameter of the bottom portion of the cup, and the periphery of the roller lextends in angular relationship to the axis thereof. That is, the periphery of the roller is formed on a taper complemental to that of the body of the cup, the inner end of the roller being slightly larger in diameter than the outer end. The roller I6 is ro. tatably mounted upon the cup making machine in the conventional manner, and is moved radially to, compress the bottom portion of the cup. against the forming member II, which is mount- 55 portion. i 10 ed for rotation and as it, together with the cup, rotates rotary motion is imparted to the roller I I. That is, the roller I6 acts after the manner of a sun gear. This arrangement is illustrated in Figure 2. Due to the fact that the roller I6 is of substantial diameter, a substantial portion of the infolded portion is contacted by the roller.

As illustrated in Figure 2, the infolded portion of the body is contacted by the teeth of the roller I6 throughout an arc extending approximately from I8 to I9, the greatest pressure being exerted in the center of the arc at 20.

Heretofore, it has been common practice to use a comparatively small roller havingA a smooth periphery. The action of such a roller is -to press the infolded portion against the iiange of the bottom, but in doing so the remaining part of the infolded portion is distorted with the result that as the cup rotates the pressed-in portions progressively spring outwardly.

With the construction previously described, the diameter of the infolded portion is materially increased, due to the stretching of the paper by the formation ofv the uniform corrugations 2l, and more particularly this stretching results from the fact that the infolded portion is securely gripped at each side of the point where the iinal radial stretching Ytakes place. 'I'hat is, the in- 'folded portion is gripped each side of the point 20 and therefore, there is a lparticular radial and circumferential stretch of thevpaper at this point,

voutwardly from the flange I3, with the result that the bottom is secured in the cup in liquid tight relationship thereto.

During rotation of the cup and the roller I6, the infolded portion is gradually stretched and pressed into form and the overlapping portions of the cup body are ironed down, or pressed together, so that there is no possibility for seepage of the liquid in the cup at these points. Figure 2 illustrates the relative arrangement and action between the roller I6 and the cup, the cup having traveled past the contacting surface of the roller I6 for a substantial portion of the rst revolution of the cup. During subsequent rotation of the cup and roller I6, the overlapping joints of the body will be ironed substantially at.

What I claim is:

1. A container comprising a tapered body portion formed of flexible material, a bottom member arranged in the body and having a depending annular flange extending toward and being spaced apart from the lower end of said body, said lower end portion of the bodybeing folded over the end of said iiange, said infolded portion being expanded outwardly into engagement with the inner side of said flange and being formed with lengthwise extending corrugations.

2. A bottom structure for a container having a body formed of a plurality of overlapping layers of flexible material comprising a bottom member formed with a depending annular ange and being arranged in the body of the container with said flange extending toward one end of the container and being spaced apart axially therefrom, the extending portion of the body being folded over and expanded outwardly against said flange and being provided with a series o'f uniform axially extending corrugations to maintain the same expanded against said ange.

3. The method of forming containers having a tapered body portion formed of flexible material' comprising inserting a bottom member ha/ving a depending annular flange with th'e ange extending toward the smaller end of the body and spaced apart axially therefrom, folding the smaller end portion of the body over the edge of said ange, pressing successive portions of said of said pressed portion into lengthwise extending corrugations.

MAX SIDON'.A 

